Table 2: Comparison of EC50 of Agonist-Induced Activation of m3 Muscarinic Receptor or of Endogenous β2-Adrenergic Receptor Measured by Four Luciferase Reporter Assays

RE M3R (M) β2AR (M)
CRE > 1.6 × 10-4 9.2 ×10-8
NFAT-RE 8.0 × 10-8 N/A
SRE 1.2 × 10-7 N/A
SRF-RE 9.2 × 10-8 N/A